package com.cloudeoffice;

import com.cloudeoffice.server.pojo.Employee;
import com.cloudeoffice.server.pojo.MailConstants;
import com.rabbitmq.client.Channel;
import org.slf4j.Logger;

import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.support.AmqpHeaders;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.mail.MailProperties;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHeaders;
import org.springframework.stereotype.Component;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.IOException;
import java.util.Date;


//消息接收者
@Component
public class MailReceiver {
    private static final Logger logger= LoggerFactory.getLogger(MailReceiver.class);

    @Autowired
    private JavaMailSender javaMailSender;

    @Autowired
    private MailProperties mailProperties;

    @Autowired
    private TemplateEngine templateEngine;

    @Autowired
    private RedisTemplate redisTemplate;

    //邮件发送
    @RabbitListener(queues = MailConstants.MAIL_QUEUE_NAME)
    public void handler(Message message, Channel channel){
        Employee employee = (Employee)message.getPayload();
        MessageHeaders headers = message.getHeaders();
        //消息序号
        long tag = (long)headers.get(AmqpHeaders.DELIVERY_TAG);
        String msgId=(String)headers.get("spring_returned_message_correlation");
        HashOperations hashOperations = redisTemplate.opsForHash();
        try{
            if (hashOperations.entries("mail_log").containsKey(msgId)){
                //redis中包含 key，说明消息已经被消费
                logger.info("消息已经被消费=====>{}", msgId);
                /*
                * 手动确认消息
                * tag:消息序号
                * multiple:是否多条
                *
                * */
                channel.basicAck(tag,false);
                return;
            }
            MimeMessage mimeMessage = javaMailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage);
            //发件人
            helper.setFrom(mailProperties.getUsername());
            //接收人
            helper.setTo(employee.getEmail());
            //主题
            helper.setSubject("入职欢迎邮件");
            //发送日期
            helper.setSentDate(new Date());
            //邮件内容
            Context context = new Context();
            context.setVariable("name",employee.getName());
            context.setVariable("posName",employee.getPosition().getName());
            context.setVariable("joblevelName",employee.getJoblevel().getName());
            context.setVariable("departmentName",employee.getDepartment().getName());
            String mail = templateEngine.process("mail", context);
            helper.setText(mail,true);
            //发送邮件
            javaMailSender.send(mimeMessage);
            //将消息id存入 redis
            hashOperations.put("mail_log",msgId,"OK");
            //手动确认消息
            channel.basicAck(tag,false);
        } catch (Exception e) {
            try {
                /*
                * 手动确认消息
                * tag:消息序号
                * multiple:是否多条
                * requeue:是否回退到队列
                * */
                channel.basicNack(tag,false,true);

            } catch (IOException exception) {
                logger.error("邮件发送失败========>{}",exception.getMessage());
            }
            logger.error("邮件发送失败========>{}",e.getMessage());
        }
    }

}
